TY  - JOUR
AU  - Klobes, B.
AU  - Bessas, D.
AU  - Juranyi, F.
AU  - Görlitz, H.
AU  - Pacheco, V.
AU  - Hermann, Raphael
TI  - Effect of nanocrystallinity on lattice dynamics in Bi $_{2}$ Te $_{3}$ based thermoelectrics
JO  - Physica status solidi / Rapid research letters
VL  - 9
IS  - 1
SN  - 1862-6254
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2014-06567
SP  - 57–61
PY  - 2015
AB  - The lattice dynamics in as-cast and nanocrystalline thermoelectric Bi2Te3 based p-type and n-type material were investigated using inelastic neutron scattering. Generalized densities of phonon states show substantial agreement between the lattice dynamics in as-cast samples and previous studies. The lattice dynamics in the nanocrystalline materials differ significantly from its as-cast counterparts in the acoustic phonon regime. In nanocrystalline p-type and n-type compounds, the average acoustic phonon group velocity was found to be reduced to 80(5)% and 95(2)% of the value in as-cast material. It is argued that point-defect and strain contrast scattering may play an important role for the understanding of lattice thermal conductivity in (nanocrystalline) Bi2Te3 based thermoelectrics beside the observed decrease of sound velocity
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000348763500009
DO  - DOI:10.1002/pssr.201409479
UR  - https://juser.fz-juelich.de/record/173154
ER  -